Improvement in stone-channeling machine



UNITED STATES, PATENT FICE `GEORGE WARDWELL, -OF RUTLAND, VERMONT.

IM PROVEM ENT AIN STONE-CHANNELING4 MACHINE.

Specification forming part of Letters Patent No.. 105,391, dated July 12, 1870.

To all whom it may concern: `nec'ted to the chisel gang; and, instead of c Beit known thatI, GEORGE JVARDWELL, using a single spring applied directly upon of Rutland, in the county of Rutland and State the frame of the carriage beneath the rear end of Vermont, have invented certain new and of a single vibrating lever, I now employ two y usefulllmprovements relating tothe Chansprings,`one of which is applied between the neling of Stone; and Ido hereby declare that two arms and the other on top of the upper the following is a full, clear, and exact Adearm of the bifurcated lever, and held in place scription thereof, reference -bein g had to the by an adjusting-stirrup, which connects toaocompanying drawing, making part of this gether the two arms. specification, in which- `'Io enable others skilled in the art to under- Figure 1., Plate 1, is an elevation of one side stand my invention, I will describe its conof a stone-channeling machine mounted upon struction and operation.

a track and having my improvements applied. Before describing the invention herein Fig. 2, Plate 2, is a top view of` the -machine claimed, I will briey describe those part-s of without the boiler. Fig. 3, Plate 3, is a front a stone-channeling machineto which the i11- .elevation of the machine complete. Fig. 4, vention is represented in the accompanying Plate 3, is a side view of the improved device drawing as being applied. l bywhichmotion is transmittedfrom the crank- A is a horizontal bed or frame, which is plates to thei-*gangsof cutters. Fig-5, Plate mounted upon flanged wheels W, adapted to 4, is an enlarged view of the device shown by move upon a track, T. B is a steam-boiler, Fig.`4, indicating in dotted lines the positions and B the fire-box thereof for supplying an `of the parts at the instant of giving the blow. engine, E', with its motive power. B is a pit- Similar letters of reference indicate correman, which communicates rotary motion to a sponding parts in the several figures.. horizontal crank-shaft, K,which shaft extends Thisi invention relates to improvements on transversely across the front partof the carmachinery which is designed for cutting ehanriage, and has its bearings in standards F F. nels in quarry-beds preparatory to the removal W is a worm-wheel, which engages with the of blockshof stone therefrom, and more parteeth of a tangent spur, fm, and thus gives a ticularly the invention relates to improvements slow motion to a longitudinal shaft, S, on the on the method of communicating motion from front end of which the spur-wheel m is keyed. a driving-power to the channeling-chisels set The shaft S extends backward and downward forth` in Letters Patent of the United States through suitable bearings, and carries a bevgranted to me on the 10th day of November, eled pinion, f', on its rear end. The pinion f' 1863. Y is intended to give rotary motion to either one In the machine for which Letters Patent of two laterally-slidingwheels, f f, which are were granted to me, as aforesaid, motion was on the axle A2 of the rear truck-wheels W W'. transmitted to a gang of chisels from adriv- The wheels f f are moved into and out of gear ing-shaft operating through the medium of a by means of hand-levers S acting through the single vertically-vibrating lever which had its medium of a sliding rod and pusher. In this fulcrum on the carriage-frame, and which was way the machine is moved on its track eitherconnected by straps to 'the gang of chisels. forward or backward, and, by disengaging Beneath the rear end of said lever a spring both wheels j'j'from their pinion f', the prowasapplied. y t t gressive and retrogressive motion will cease, Instead of employing asin gle lever, as above although the rota-ry motion of the shaft K may stated,fI \now employ a double compound or be continued. bifurcated lever, which consists of two arms, On each end of the shaft K a crank or crankwhich are connected together and pivoted to plate, F, is keyed, to the outer side of which the frame of the carriage at their rear ends. a plate, d, is pivoted, at d1 and again at- One of these arms is connected loosely to the tached to the crank-plate at d2. A wrist-pin, driving-power, and the lother is similarly conp, is fixed to each plate din such manner that,

by removing the fastening d2 and adjusting this plate d so as to insert the fastening into the hole O in crank-plate E, the axis of said wrist-pin will exactly coincide with the axis of the crank-shaft K. When this is done, it is obvious that the wrist-pin will cease to oper: ate with a crank motion. The holes O in the crank-plate are for receiving the pin d2, for adjusting the length of strokes of the wristpin. Between each gang G of chisels and the crank-plate E nearest toitis a standard-guide, S2, which is secured at its lower end to the outer side of the carriage-frame A and to the standard-bearings F, and at its upper end to the horizontal cross-head b2 and braces b b. To each guide S2 a gang, G, of stone-channeling chisels is applied by means of two clamps, C C', which allow the gang to be moved up and down. These clamps C C', Iprefer to construct substantially as described in Letters Patent granted to me on the 18th day of May, 1869.

I will now proceed to describe my improved mode of transmitting motion to the gang or gangs of chisels, as the case may be, so that the shocks incident to the repeated sudden contact of the chisels with the stone which is being channeled by them will not be transmitted to the machinery used to operate them.

On each side of the machine, if two gangs of chisels are used, I apply the following described device: t is a stirrup, which is applied on the wrist-pin p, and which has a passage through it for receiving the arm a of a compound lever. On the inner plate of the lower clamp C of each gang G of chisels a loop, u, is constructed, through which passes freely the free end of the lower arm, a', of the said compound lever. The compound lever consists of two arms or levers, as above shown, which are both pivoted to a fulcrum, c, which extends out from a standard, A1, fixed to the frame A of the carriage. Both arms vibrate together, and to some extent independently of one another, about said fixed pin c. These arms are connected together at a point between their fulcrum or pivot c and their connections to the chisel-gang G and wrist-pin p by means of straps c c, a plate, h, and nuts g g, and between the two arms, and also between the upper arm and the plate 71l springs r 1" are interposed, as clearly shown in Figs. l, 4, and 5. It will thus be seen that an adjustment can be made which will give more or less zompression to the springs, as may be deslret.

When the fulcrum or pivot pin c is located as high as represented in the drawing, the lower arm, a', will be bent downward, and terminated in the curved portion represented in Figs. 4 and 5, which portion is allowed to play freely through the loop u; but infpractice I prefer to locate the fulcrum or pivot-pin c in or nearly in a horizontal plane, which would represent the middle of the full stroke given to the chisel-gang. By this arrangement of the said pin the lower arm, a', will not be so much bent, and the driving crank-shaft K can be arranged lower than is shown in the drawing, and obtain the same length of strokes of the chisel-gan g.

By reference to Figs. 4 and 5 of the drawing, the operation of my invention will be understood. It will be seen that the free ends of arms a a both rise and descend with the wrist-pin p and chisel-gang clamp C.

In Fig. 4 the full lines indicate the position of the parts when at the termination of the downstroke of the chiselgang, and the dotted lines represent the position of the same parts when at the termination of their upstroke.

The crank-plate E is rotated in the direction indicated by the arrow in Fig. 4, and makes about three-fifths of a revolution during the act of lifting the chisel-gan g from the termina tion of its downstroke to the termination of its upstroke, as indicated by the stars in Fig. 4. The other two-fifths of a revolution of plate F effect the downstroke of the chisel-gang. Thus it will be seen that the lifting operation of the chisel-gang is effected by a compara tively slow movement, while the descending strokes of the gang are much more rapid. The reason of this variable motion is that the stirrup t slides upon the upper arm, a, and during a portion of the ascending strokes moves farther from the fulcrum c, thus lengthening the leverage and lifting slower, while during part of the descending strokes the leverage is shortened, and the motion thereby accelerated.

It will be seen that the weight of the bifurcated or compound lever is partly sustained by the fulcrum-pin c, thus relieving the wristpin and diminishing friction thereon; also, that there will be very little downward draft or strain on the wrist-pin when the chisel-gang is arrested at the completion ofits downstroke, as this draft or strain is almost wholly received upon the fulcrum-pin c on the frame of the machine.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A bifurcated or compound lever the arms of which are suitably held together, an d which is pivoted to and supported by the frame of the carriage, and connected at its free ends to the driving-power and gang of chisels, substantially as described.

2. Springs 1' r', applied to the bifurcated lever, so as to operate substantially as described.

3. An adjusting-clamp applied to the com pound lever for connecting together the two arms thereof, and also admitting the adjustment of the springs r r', substantially as described.

4. The swivel-stirrup t, applied to the wristpin p as a. means of `connection `between one of the arms of the compound lever and the said Wrist-pin, substantially as described.

4 5. In a. stone channeling or cutting machine, a lever-connection between the crank-shaft or face-plate and the cutters7 when the lever is so connected to the crank-shaft or to the faceplate as to produce a variable up-and-down movement of the cutters, substantially as described.

GEO. J. WARDWELL. Witnesses:

G. CLARK,y GEO. E. ROYCE. 

